Quran 29:53

وَيَسۡتَعۡجِلُونَكَ بِٱلۡعَذَابِ‌ۚ وَلَوۡلَآ أَجَلٌ۬ مُّسَمًّ۬ى لَّجَآءَهُمُ ٱلۡعَذَابُ وَلَيَأۡتِيَنَّہُم بَغۡتَةً۬ وَهُمۡ لَا يَشۡعُرُونَ ٥٣

They challenge you to bring the retribution! If it were not for a predetermined appointment, the retribution would have come to them immediately. Certainly, it will come to them suddenly, when they least expect it.